Linear Functions

The table shows values of a linear function $f$.

<table> <thead> <tr> <th>$x$</th> <th>0</th> <th>1</th> <th>2</th> <th>3</th> </tr> </thead> <tbody><tr> <td>$f(x)$</td> <td>4</td> <td>7</td> <td>10</td> <td>13</td> </tr> <tr> <td>What is $f(5)$?</td> <td></td> <td></td> <td></td> <td></td> </tr> </tbody></table>